Lizzo's Grammys Invite Slammed, Accusers' Attorney Claims Double Standard

Lizzo presenting at the Grammys raised many eyebrows -- including those of the lawyer repping the backup dancers suing her, and he's claiming female privilege is the only reason she was there. Neama Rahmani, who represents multiple Lizzo accusers, tells TMZ ... he's disappointed the singer was tapped to present the Best R&B Song award, and openly wonders why the Recording Academy would opt to give a platform to…